options: commandline: support "--no-opt" for flag options

When parsing the command line, map "--no-foo" to "--foo=no" if an
option named "foo" exists and is a flag option. Non-empty parameters
are not allowed with this syntax ("--no-foo=no" is invalid).

This implementation is different from the existing "--nofoo" variants
for most flag options. Those are implemented as completely separate
options; there's an option named "fs" and a separate option named
"nofs" (thus "--no-nofs" actually works after this change...). The
reason for adding the new syntax is to support the much more standard
"--no-" prefix and to allow eventually cleaning up the option handling
(though the "nofoo" variants of existing options can't be removed soon
due to backwards compatibility).

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